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Amazon is up about 1.9% through mid-morning Friday to $1,178 a share, adding $1.7 billion to Bezos' net worth and pushing his total fortune to over $99 billion, based on data from the Bloomberg Billionaires Index.

With Amazon up 1.9% Friday, his stake in the company would have increased from $91.2 billion, based on Amazon's closing price of around $1,156 on Wednesday, to $92.9 billion at the $1,178 price Friday morning — a $1.7 billion jump.

That would put his net worth at $99.6 billion.

In addition to his Amazon holdings and cash investments, Bezos owns a roughly $3 billion stake in rocket company Blue Origin, and he also owns The Washington Post, which he paid $250 million for, according to Bloomberg.